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Question

Physics Question on laws of motion

Which one of the following statements is incorrect ?

A

Coefficient of sliding friction has dimensions of length.

B

Rolling friction is smaller than sliding friction.

C

Frictional force opposes the relative motion.

D

Limiting value of static friction is directly proportional to normal reaction.

Answer

Coefficient of sliding friction has dimensions of length.

Explanation

Solution

Coefficient of sliding friction has no dimension.
f=μsNf = \mu_s N
⇒ μs=fN\Rightarrow \, \mu_s = \frac{f}{N}